The strength of the rebuke indicates how the journalist’s killing has inflamed tensions between Riyadh and Washington

Saudi Arabia on Monday delivered a rebuke to the U.S. Senate for passing a resolution that blamed the kingdom’s crown prince for the murder of journalist Jamal Khashoggi, a rare criticism by Riyadh for its most important ally.

The Saudi Ministry of Foreign Affairs dismissed the Senate’s conclusion that Crown Prince Mohammed bin Salman was involved in the killing as based on “unsubstantiated claims and allegations.” The rebuttal used unusually blunt language for a diplomatic communiqué, showing how the Khashoggi killing has inflamed tensions between Saudi Arabia and much of Washington’s establishment.

“The kingdom categorically rejects any interference in its internal affairs,” the Saudi Ministry of Foreign Affairs said. “And any attempts to undermine its sovereignty or diminish its stature.”

The Saudi government has vowed to hold the perpetrators of the Oct. 2 murder accountable and repeatedly denied that Prince Mohammed knew about the operation that led to the death of Mr. Khashoggi—a critic of the Saudi government and a Washington Post columnist—inside the Saudi consulate in Istanbul.

But while the Trump administration has defended the crown prince, arguing there is no direct link between him and the murder, hostility toward Saudi Arabia is mounting in Congress and goes beyond the Khashoggi killing.

The Senate on Thursday also passed a resolution with bipartisan support calling for the U.S. to withdraw its backing for the Saudi-led coalition war in Yemen. The measure, opposed by House Republicans, is unlikely to affect U.S. military policy in the region for now. The Senate is separately reviewing a bill that would halt weapons sales to the kingdom.

The Senate reached its conclusion on Prince Mohammed’s alleged involvement in Mr. Khashoggi’s killing after a group of senators were briefed by Central Intelligence Agency Director Gina Haspel.